Posted this over at the LT1 tech section but I'm hoping for good insight here. Recently dropped in my new 383 and have her running well with a couple of exceptions. I have split BLM's at idle (cell 16) and deceleration (Cell 17). I'm pretty certain this is due to my AS&M 58mm TB and the IAC setup. I've read of a fix for this using a 1/2 inch fitting and an o-ring but I was hoping for a little more detailed info so I can do this and fix my BLM's. I raised my IAC up to over 80 steps and my BLM's almost matched up but of course the car will nearly stall or die with the steps this high. Does anyone have any first hand info or know of a link that can detail the fix for me?

 

I have a similar set up with a stock bored 52mm TB and same split BLM's. So your Tb may not neccesarrily be your problem. Do a search here on split blm's , it has been discussed and someone had posted a link to the TB fix.

 

http://para.noid.org/~lj/
Look at the "split blm" section
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Thanks for the link. Just what I was looking for.